#6 TITANIUM Ultraflex Nib Units and Assemblies

#6 TITANIUM Ultraflex Nib Units and Assemblies

Regular price $45.00

 (We are out of stock on EEF and EF nib Units. We are expecting fresh stock in June).

Osprey Pens introduces Titanium Ultra-flex Nib units in Extra-Extra-Fine, Extra-Fine, Fine and Medium tip sizes. The nib is springy, and has more give than a stainless steel ultraflex. When writing with it, the nib feels softer than stainless steel and is reminiscent of old vintage flex nibs.

If you have already purchased an Osprey Milano, Scholar or Madison fountain pen, you can now buy replacement assemblies or just a nib unit.

The assemblies cost $45, while the replacement nib units are priced at $42. The additional parts that come with the assembly are the generic outer section and the osprey converter, that you don't get with just buying the nib unit.

If you are buying an assembly for the Madison series, it comes with a generic Clear outer section, and if you are buying for a Scholar or a Milano, it comes with a generic Black outer section.

Note that the #6 ultra-flex Titanium nib units come with custom ebonite feed to keep up with ink demands of flex writing. These units do not accept International converters or cartridges and work best with the wide-mouthed osprey converters, designed specifically for use with ultra-flex nib units.

Do not use India Inks, they can clog the ebonite feeds. Fountain Pen inks are recommended. Few examples of inks that worked best with ebonite feeds as reported by our customers:  The Noodlers standard Black , MontBlanc Burgundy Red ink, Herbin Perle Noire, Platinum carbon Black, D'Artremis document Black ink, Pilot Iroshizuku line of inks, Rohrer & Klingner SketchINK. Pls send us your feedback on inks that worked best, and inks that didn't, to continue to add to this list. You know and we know that a big part of getting the most out of any pen is to get the pen/ink combination right, especially with the flex nibs.

Tiny tip: Make sure to wash the nib and feed right away after use, if you suspect the ink has any pigments that could gummy the feed.

Send us an email to info@ospreypens.com if you have any questions.

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Customer Reviews

Based on 4 reviews

As advertised. A very nice product.


The thick one is good, but the thin one is not very thin, so it's not very good. If this is the case, the G-pen unit would be better.

Super smooth, lovely lines

Just got this, so far so good. great customer service from Osprey Pens, and the nib is super fun to draw with - much easier to draw with than the zebra G nib (although that's great as well) because the tip is more rounded so it doesn't catch on the paper if you draw upwards - the line doesn't go quite as thin as some of the other nibs but the ratio from thick to thin is incredible, with no railroading, I'd guess about 0.2mm to 4mm, looks super cool. Thanks guys!

Jay Daley
Incredibly smooth, excellent flex nib

I have a lot of flex nibs, both modern and vintage, and my Osprey pen with this nib is one of the few I always keep inked because I enjoy writing with it so much. The most noticeable thing about it is how smooth it is for a flex nib. Even if I abuse it by pushing very hard upwards on rough paper, it does not catch. The other excellent feature is how strongly it snaps back from flexing. It's a reasonably firm flex and can flex 1.5mm ~ 2mm when pushed, but it takes a lot of pressure to flex it that far. If you use it for ordinary copperplate then it's an ideal firmness for good control. The nib and feed deliver a lot of ink so it has never skipped on me, but it does mean that inks come out quite dark. I tried a sheening ink in it and that looked really nice, but I don't know if that kind of ink is good for the feed. Finally, I have the EEF and that gives a very thin line with no pressure. Not the thinnest of any modern pen but easily good enough for a nice hand.